| Optimization Design |
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| Multi-objective optimal design of UUV pressure structure |
| GAO Qi-sheng1,2, ZHU Xing-hua1,2, YU Yan-kai1,2, ZHENG Rong1,2 |
1.Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang 110016, China;
2.Institute of Robotics and Intelligent Manufacturing Innovation, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract UUV (unmanned underwater vehicle) has a wide application prospects in the marine civil and military fields. As an important part, UUV pressure structure affects the load capacity of UUV and can guarantee the UUV execute navigation tasks safely and efficiently, so it is of great significance to optimize the pressure structure. In order to reduce weight at the greatest extent, and balance the contradictory among the weight, structural strength and stability of pressure structure, a multi-objective optimization method based on the combined weighted response surface method was proposed to improve the comprehensive capacities of UUV. The initial sampling points were obtained through the design of experiment, and the response values were calculated and the agent model was constructed by using the finite element tool.Then, the sub-target was normalized by the compromise programming method, and the weight coefficients of sub-targets were set up by combined weighted method to achieve the multi-objective optimal design of pressure structure. Taking a certain type of UUV as an example, the multi-objective optimal design for its pressure structure with trapezoid rib was carried out based on the proposed method.The weight of the optimized pressure structure was reduced by 6.6%, the rib stress was reduced by 6.7%, and the stability requirement was met at the same time. On this basis, the pressure structures with different rib forms were optimized with weight as the optimization goal and with weight, structural strength and stability as the comprehensive optimization goals, respectively. The results showed that the comprehensive optimization effect of the pressure structure with trapezoid rib was the best. This method is suitable for the multi-objective optimization of UUV pressure structure, and the research results can provide a theoretical guidance for the optimal design of UUV pressure structure, which has the practical engineering significance.
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Received: 04 June 2019
Published: 28 April 2020
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UUV耐压结构多目标优化设计
UUV（unmanned underwater vehicle，无人水下航行器）在海洋民用与军事领域具有广阔的应用前景。UUV耐压结构作为影响UUV负载能力及保障UUV航行任务安全高效执行的重要部件，其优化设计有重要意义。为了最大程度地实现减重目标，有效平衡耐压结构质量、结构强度和稳定性之间的矛盾，进而提升UUV综合性能，提出一种基于组合加权响应面法的多目标优化方法。通过试验设计得到初始采样点，利用有限元工具计算响应值并构建代理模型；然后，以折衷规划法对子目标进行归一化处理，采用组合加权法设定子目标权重系数，以进行耐压结构的多目标优化设计。以某型UUV为例，利用所提方法对其梯形肋骨耐压结构进行多目标优化设计，优化后耐压结构质量减轻了6.6%，肋骨应力下降了6.7%，同时满足稳定性要求。在此基础上，分别以质量为优化目标和以质量、结构强度和稳定性为综合优化目标，对不同肋骨形式耐压结构进行优化设计。结果表明：梯形肋骨耐压结构的综合优化效果最佳。该研究方法适用于UUV耐压结构的多目标优化，研究结果可为UUV耐压结构优化设计提供理论指导，具有实际工程意义。
关键词：
耐压结构,
组合加权法,
响应面法,
多目标优化
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